Challenges for device-free radio-based activity recognition

In this paper we provide an introduction to the relatively new field of device-free radio-based activity recognition (DFAR). While the research in device-free radio-based localization (DFL) has progressed in recent years, only few works exist which distinguish activities using this approach. Thus, we give an overview over the most important works investigating device-free localization and activity recognition. We then discuss how radio-based activity recognition may profit from the current state of research and which challenges need to be addressed to enable the radio based recognition of activities. Finally, we present our vision of future DFAR systems and our plans for future work.